CVE-2020-36463Network attack vector

Undefined behavior via unconditional Send implementations

Published Aug 8, 2021 · Updated Aug 4, 2024

Data races in multiqueue 0.3.2 and earlier allow attackers to trigger undefined behavior by moving non-Send values between threads. The InnerSend<RW, T>, InnerRecv<RW, T>, FutInnerSend<RW, T>, and FutInnerRecv<RW, T> implementations mark their generic payloads Send without requiring T: Send. Exploitation requires a consuming application to enqueue a non-Send value and move it across threads; the resulting data race or other undefined behavior occurs within that application.

CVSS severity8.1
High
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data races in multiqueue 0.3.2 and earlier allow attackers to trigger undefined behavior by moving non-Send values between threads. The InnerSend<RW, T>, InnerRecv<RW, T>, FutInnerSend<RW, T>, and FutInnerRecv<RW, T> implementations mark their generic payloads Send without requiring T: Send. Exploitation requires a consuming application to enqueue a non-Send value and move it across threads; the resulting data race or other undefined behavior occurs within that application.

The record

CVE
CVE-2020-36463
Published
Aug 8, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, CWE-362
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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